Estrogen is secreted by the ovaries. Estrogen protects against heart disease, stroke, osteoporosis, Alzheimer's Disease and memory disorders. It protects against vaginal atrophy, urinary incontinence, and prevents symptoms of menopause, including hot flashes and temperature dis-regulation. It improves balance by improving the visual somatosensory system in the central nervous system. Estrogen deficiency results in urogenital atrophy, incontinence, sagging skin in the breasts, increased skin wrinkles of the face, decreased fatigue, depression, mood swings and decreased libido. It is of extreme importance that the estrogen prescribed be a natural estrogen and not a synthetic estrogen. Synthetic estrogens can be harmful to your body, so for optimal protection natural estrogen supplementation should be balanced by natural progesterone supplementation.